Rock drill hood



' the case is preferably squared Patented Sept. 6, 1938 UNITED smrss PATEN'E FFMIE ROCK DRILLv HOOD Application June 13, 1938, Serial No. 213,408

4 Claims.

My invention relates to that class of devices which are employed for disposing of the dust created by rock drilling operations, and an object of my invention, among others, is the production of a rock drill hood that may be readily placed in position and as readily removed therefrom without displacing the drill from the hole into which it extends; and a further object of the invention is to provide means for retaining the hood in position; and a still further object is to provide a hood that, while possessing the conveniences mentioned, shall be so constructed as to effectually permit removal and dispose of the dust in a most satisfactory manner.

One form of a drill hood embodying my invention and in the construction and use of which the objects herein set out, as Well as others, may be attained is illustrated in the accompanying drawing in which- Figure 1 is a top plan view of my improved drill hood.

Figure 2 is a view in central vertical section through the same.

Figure 3 is an isometric perspective view.

In operations embodying drilling of rock it is not only desirable, but the law requires that means shall be employed for removing the dust and thereby prevent its inhalation by operators, this in order to prevent disease resulting from the introduction of such dust to the lungs by breathing. It is also desirable that the hood may be placed in position with little inconvenience and as readily removed without disturbing the drill and that the hood shall also be securely retained in position. My improved drill hood, illustrated and described herein, possesses these qualifications and comprises a case 5 composed of any suitable material, preferably partially circular in form and having a bottom 6, a top l, and a side wall 8. The side wall has an opening 9 through what I term the rear side of the case and from which a nipple IU extends to receive a conducting tube Il to convey away the dust which enters the chamber in the case from the operation of a drill l2 in a hole I3 in rock i4, as shown in Fig. 2 of the drawing. The bottom 6 has an opening l5 to receive a drill, and a slot i6 extends from said opening out at the fro-nt of the case. The top 1 also has a slot Il located vertically above the slot i6 and opening I5 and registering therewith. The front of off, as shown at i9, and a slot 2@ is formed through this front wall of a width substantially that of the slots I6 and Il. These slots are each of a width slightly (Cl. Z55-50) greater than the diameter of the shank I3 of the drill so that the case may be freely slid into place with the drill in the hole I3 and as readily removed, said slots, however, not being open enough to prevent free ilow of air currents from within the case out through the opening 9, but being large enough to enhance such flow.

In order to aid in obtaining this result in the flow of air currents a partition` 2| is extended downwardly from the top 'l to such distance as will secure the most effective results, in the structure shown herein such partition extending down.. ward nearly half` way to the bottom. This partition is of U-shape, of a width substantially that of the slots i6 and il, the bend 22 in the partition terminating the slot formed by the side 'walls 2l of such partition.

As an effective means for retaining the case in position and preventing its displacement from vibration created by operation of a drill, Iprovide a retaining clip 23 formed of spring metal and having retaining bends 24 converging toward the front of the clip and with divergent prongs 25 to form a guide opening drill shank, as shown in'Fig. l. A cleat 26 secured to the top 'l is used to clamp the clip in.

place, and a stop 2l may be provided to prevent any backward mo-vement of the clip on the case should the cleat become loose to any extent.

The operation of the hood derstood from the foregoing description taken in connection with the drawing, it being observed that it is frequently desirable to position the hood and to remove it without displacing the drill, and this may be readily done by sliding the hood into place, the drill shank passing along the slots in the top and bottom and partition, into theV opening between the prongs 25, and into the enlarged space between the arms of the clip.

These slots also possess the advantage of enabling the operator to closely observe the action of the drill, which is important, particularly in dimensional stone cutting or in the extraction of stone for building or monumental purposes, the drill and hole being visible through the slots which also enables the operator to tell whether or not the dust is being properly expelled.

In accordance with the provisions of the patent statutes I have described the principles of operation of my invention, together with the device which I now consider to represent the best embodiment thereof; but I desire to have it understood that the device shown is only illustrativeand that the invention may be carried out by for reception of the will be readily unv other means and applied to uses other than those above set out.

I claim:

1. A rock drill hood including a case having an outlet opening and also having an inlet opening for admission of air through the side Wall of the case, said inlet opening being of a size to permit admission of a drill shank by sliding movement of the case to engage said shank, and means secured to said case and arranged for automatic engagement of said drill shank by said sliding movement to removably hold the case engaged with said shank.

2. A rock drill hood including a case having an outlet opening and also having an inlet opening for admission of air through the side Wall of the case and with slots in its top and bottom Walls communicating With said inlet opening, and holding means secured to the top of the case adjacent the slot therein to automatically engage said drill shank by sliding movement of the case to removably hold the case engaged with said shank.

3. A rock drill hood including a case having an outlet opening and also having an inlet opening for admission of air through the side Wall of the case, said inlet opening being of a size to permit admission of a drill shank by sliding movement of the case to engage said shank, and a spring clip secured to the top of the case and having converging arms to resiliently receive said drill shank to removably secure the case to said shank.

4. A rock drill hood including a case having an outlet opening and also having an inlet opening for admission of air through the side Wall of the case, said inlet opening being of a size to permit admission of a drill shank by sliding movement of the case to engage said shank, and a spring clip secured to the top of the case bounding said inlet opening and having converging arms to removably receive said drill shank to temporarily secure the case to said shank, said arms also having diverging prongs to permit ready access of said shank between said arms.

LESTER C. SMITH. 

